There is generally no requirement that written agreements in these circumstances need to be typed or handwritten. So an agreement for the sale of $600 in loose diamonds may be perfectly enforceable -- even if it was written with a ballpoint pen on Looney Tunes stationary.
Definition of install. 1  transitive verb. 2  1a : to place in an office or dignity by seating in a stall or official seatb : to induct into an office, rank, or order installed the new president. 3  2 : to establish in an indicated place, condition, or status installing herself in front of the fireplace.
Because the process varies for each program and each computer, programs (including operating systems) often come with an installer, a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process. Installation typically involves code being copied/generated from the installation files to new files on the local computer for easier access by the operating system.